PHYSIOLOGICAL SKRIKS. 



"false orbital." [This is not shown in fig. ;V., \\liidi 

 represents the condition found on the right hemisphere 

 reversed.] 



Tin 1 raprmsyivian sulcus is connected neither with tin* 

 sulcus B nor with the or hi nil. 



As in the Thylacine, the prorean sulcus joins the orhinil 

 on the right side only. 



Fig. -59. (Nat. size.) 



SULC.ORB. SULC.SUPRAS. 



A 



On the caudo-mesial angle of the dorsal surface Un- 



characteristically Macropod paramedial sulcus is found 



(fig. 58). It probably represents the earliest form of the 



sulcus called " lateral ?J in Carnivores and Ungulates and 



" intraparietal " in Primates. 



There are two fragments (D and D') of a vertical sulcus 

 behind the sulcus B. 0. C. 1323 Ac. 



D. 217. A rough dissection of the brain of a Macropus. On the 

 right side almost the whole of the cerebral hemisphere has 

 been removed. On the left side the roof of the hemisphere 

 :tnd the greater part of the hippocampus have been removed 

 in order to expose the fornix (fimbria) proceeding obliquely 

 across the optic thalamus to the dorsal mmmissure. 



The nucleus caudatus is aN< exposed in the left hemi- 

 sphere. This dissection was made by the late Sir Kicbanl 

 (tlien ProfeMOr) Owen for his memoir in the Phil. Trans. 

 1837. O.C. L323 A,. 



D. 218. The brain of a Bennett's Wallaby (Macropus 



The general features of this brain resemble those of 



Parry's Wallaby (D. 216). 

 The arrangement of the sulci in this species is interesting 



I ..... ause it is intermediate between thai of the Kangaroo 



